The Murderer By Murray Leinster - https://www.gutenberg.org/cache/epub/73612/pg73612-images.html

 

The murderer's hair lifted at the back of his neck. A crawling sensation spread down his spine. There was something moving in the room! It was pitch-dark, with vague rectangles of faint grayishness where windows opened upon the rainy night outside. The murderer had left this room half an hour before, maybe only twenty minutes before. He'd gone plunging away through the darkness, knowing that before dawn the rain would have washed away the tire-tracks of his car. And then he'd remembered something. He'd come back to pick up a thing he'd left, the only thing that could possibly throw suspicion upon him. And there was something moving in the room!